It can only be filled
1. You can understand that the Bluetooth headset is equivalent to the exclusive mobile power supply of wireless Bluetooth headphones, and the built-in battery provides USB-C or MicroUSB and other data interfaces, so it can be charged directly through the charger, regardless of whether the Bluetooth headset is in the battery compartment;
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2, most of the true wireless Bluetooth headset charging strategy is, if your Bluetooth headset charging bin when you plug in the data cable charging will give priority to the battery in the headset, and then replenish the battery of the charging bin after the headset is full, if your headset is not placed in the charging bin, you can separately recharge the Bluetooth headset charging bin. In this way, after you put in the Bluetooth headset, you can supplement the energy of the Bluetooth headset;
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3, in addition to the wired charging of the data line, like Apple's AirPods II headset charging bin has supported Qi wireless charging, just place it in the general support of the Qi charging protocol wireless charging board can be charged, most of the wireless charging board is compatible with the Qi protocol, so you can directly charge it;
Oppo Bluetooth headset charging can only be put into the charging bin.